Hi, new to forum and also to Audi!
I recently bought a used 2004 Audi A3 1.6 and have had problem after problem.

Hoping someone might know what the cause could be. The problems are:

Econ button will light up and not go off (does not happen all the time)
'Burring' sound coming from front dash which gets louder faster I go.
Sometimes car revs will stick when I'm not pressing on accelerator and if on a hill can struggle to get power to move off.
Clock has changed itself and radio switches off when car is sitting turned off.
Noise coming from front dash which I can only describe as a plane flying over you.

If any of this makes sense please help as the garage will not do anything about it (they can't find a fault)